RFR: 8290023: Remove use of IgnoreUnrecognizedVMOptions in gc tests

[Leo Korinth]

On Mon, 11 Jul 2022 07:39:02 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   can I have reviews for removal of the use of `-XX:+IgnoreUnrecognizedVMOptions` for gc tests?
> 
> As per [JDK-8228493](https://bugs.openjdk.org/browse/JDK-8228493) use of that option has drawbacks wrt to test reliability, so trying to remove them by
> * duplicating `@test` blocks (mostly sme Shenandoah tests as I could not find a good way for them)
> * adding additional `@requires`
> * removing it in tests where it is not actually required
> 
> Testing: gha, running tests
> 
> Thanks,
>   Thomas

I have looked through the change, and it looks mostly good to me. TestEagerReclaimHumongousRegionsClearMarkBits after the change only runs in debug builds, is that made on purpose?

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PR: https://git.openjdk.org/jdk/pull/9443